[MDEV-15220] Broken drop in replacement for mysql and mariadb 10.1 Created: 2018-02-06  Updated: 2018-02-13

Status: Open
Project: MariaDB Server
Component/s: libmariadb
Affects Version/s: 10.2.12, 10.2
Fix Version/s: 10.2

Type: Bug Priority: Major
Reporter: Anton Avramov Assignee: Georg Richter
Resolution: Unresolved Votes: 0
Labels: None
Environment:

Debian GNU/Linux 8.10 (jessie) amd64


 Description   

I've upgraded mariadb 10.1 to mariadb 10.2. As a result my apache2 doesn't want to start with the message: 

AH00526: Syntax error on line 6 of /etc/apache2/mods-enabled/websocket_vnc_proxy.conf:
 
Can't load driver file apr_dbd_mysql.so
 
Action 'configtest' failed.
 
The Apache error log may have more information.

The part of the conf file of interest is: 

<IfModule mod_websocket.c>
 
        DBDriver mysql

It uses apr_dbd for the apache to connect to mariadb

The interesting think is that if I ldd apr_dbd_mysql.so it shows correct linking: 

# ldd /usr/lib/x86_64-linux-gnu/apr-util-1/apr_dbd_mysql.so
 
	linux-vdso.so.1 (0x00007ffd2c751000)
 
	libmysqlclient.so.18 => /usr/lib/x86_64-linux-gnu/libmysqlclient.so.18 (0x00007fd62ecec000)
 
	libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007fd62eacf000)
 
	libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007fd62e8b4000)
 
	libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fd62e5b3000)
 
	libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fd62e3af000)
 
	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fd62e004000)
 
	libssl.so.1.0.0 => /usr/lib/x86_64-linux-gnu/libssl.so.1.0.0 (0x00007fd62dda3000)
 
	libcrypto.so.1.0.0 => /usr/lib/x86_64-linux-gnu/libcrypto.so.1.0.0 (0x00007fd62d9a7000)
 
	/lib64/ld-linux-x86-64.so.2 (0x00007fd62f14d000)

Where the /usr/lib/x86_64-linux-gnu/libmysqlclient.so.18 is a symlink to libmariadb.so.3

The only way to make apache start again is to extract the file /usr/lib/libmysqlclient.so.18.0.0 from 10.1 package and put it as /usr/lib/libmysqlclient.so.18 and execute ldconfig

if I make /usr/lib/libmysqlclient.so.18 symlink to libmariadb.so.3 the apr_dbd_mysql.so doesn't load again.
I think this means that something in the headers of libmariadb.so.3 is different and it doesn't load even though it links correctly. May be this is way the 10.1 version uses and actual file for /usr/lib/libmysqlclient.so.18.0.0 instead of a symlink.



 Comments   
Comment by Georg Richter [ 2018-02-13 ]

apr_dbd_mysql calls my_init (instead of mysql_library_init()), which doesn't exist in MariaDB Connector/C.

According to the MySQL documentation my_init part of the API, at least since 5.7 (when this function was also exported on Windows).
MariaDB 10.1 libmysql exports this function on non Windows platforms only.

Comment by Sergei Golubchik [ 2018-02-13 ]

georg, so what will we do? export my_init() ?

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